Chuck



1933. G. A. ENGLUND 1,940,405

CHUCK Filed Sept. 4, 1951 a iw/ Patented Dec. 19, 1933 1,940,405

UNITED STAT AT L 1,940,405 CHUCK Gustaf A. Englund, West Hartford,Conn., as-

signor to The Jacobs Manufacturing Company, Hartford, Conn, acorporation of Connecticut Application September-4, 1931'. Serial No.551,151 I 7 Claims (01. 279-31) My invention relates to that class ofchucks In eifecting this'purpose holes 15 are diagonally more especiallydesigned for holding drills, taps, formed through the body, on oppositesides thereand similar tools, and anrobject of my invention, of, andauxiliary jaws 16 are placed in these holes, among others, is theprovision of a chuck of this the ends of the jaws being obliquely formedasat type in which' tool shanks of various; shapes may 17 to fit therectangularly shaped end lof the 60v he. placed and securely'held. i e,tap. Each of these jaws is cut away on one side One form of a chuckembodying my invention to form recesses in which springs 13 are placed,and in theiconstruction and use/of which the whichsprings thrust attheir inner ends against objectsherein set out, as well as others, maybe shoulders 19 in the holes in thechuck body and 10 attained isillustrated in the accompanying drawat their opposite ends against lips20 formed on ing; in which. the jaws, and as clearly shown inFigure 4 ofthe Figure 1 is a side view of a chuck embodying drawing. 1

my invention; Anauxiliary clamping sleeve 21 is. r screw Figure 2 is aview in section on a plane denoted, threadedly engaged with the end 22of the chuck 15 by the dotted line 22 of Figure 3. body, this sleevehaving a recess in its under side Figure 3 is a bottom end view of thechuck with a tapered wall 23 that engages the ends of showing a tool cutin section. the auxiliary jaws, and as the sleeve is turned on Figure 4is a view in section on a plane denoted its thread to move it in onedirection along the by the dottedline 4--4 of Figure 3. chuck body thejaws 16 will be forced tightly into 3., Figure 5 is a view in section ona plane denoted engagement with the rectangularly shaped end by thedotted line 5-5 of Figure 4. 14 of the tap. Upon turning said sleeve tomove it In the accompanying drawing the numeral 6 in the oppositedirection the springs 18 will redenotes the body of my improved chuckhaving lease the auxiliary jaws from the end of the tap. the usualtapered opening for the reception of In this structure the jaws '7 willoperate in the 5a spindle to which the chuck is to be attached, usualmanner to grip and hold the round porsaid body also having a recess toreceive a drill tion 10 of the tool shank. shank with obliquely arrangedopenings there- In accordance with the provisions of the patfrom inwhich chuck jaws '7 are located, said'jaws ent statutes I have describedthe principles of being threaded to fit the thread of a jaw operatingoperation of my invention, together with the de- 30 ring 8 secured to ajaw operating sleeve 9 rotatably vice which I now consider to representthe best mounted on the body in a manner common to embodiment thereof;but I desire to have it unchucks of this type, rotation of the sleeveimdersood that the device shown is only illustrative partinglongitudinal movement to the chuck jaws and that the invention may becarried out by other for the purpose of grasping or releasing a shank 10means and applied to uses other than those above 5 of a cutting tool,this tool being'a tap as illusset out.

trated herein. I claim: g

It is common to form the shanks of drills and 1. A chuck including a.body having therein a similar tools round in cross section, the ends ofthe recess for a drill shank and a. hole intersecting jaws '7 beinground in shape in cross section. said recess, a set of chuck jaws forsecuring a In order to increase the grip of the jaws upon tool shankfrom turning movement in said re- U such a tool shank I have formed agroove 11 of cess, a jaw located in said hole and movable lonrectangularshape thereby providing teeth 12 gitudinally transversely of said shankto engage on opposite sides of the mouth of each groove it, a clampsleeve supported on said body, and and extending lengthwise of the shankengagmeans for causing said sleeve to engage across 5 ing side .13 ofeach jaw. This provides biting one end of said jaw and force theopposite exedges or corners that will effectually prevent turntreme endthereof into contact with said tool ing movement of the tool within thejaws. shank.

Taps in a common form of construction have 2. A chuck including a bodyhaving therein a their ends 14 of rectangular or non-circular formrecess for a drill shank and a hole intersecting 59 to be receivedwithin an opening of like shape said recess, a set of chuck jaws forsecuring a m, in a bar, which bar is used for manual operation toolshank from turning movement in said recess, of the tap in drilling ahole. My present invena jaw located in said hole and movable longitutioncontemplates the use of this angularly dinally transversely of saidshank to engage it, shaped end'of the tap as an aid in holding the tapand a clamp sleeve screw threadedly mounted on 55 within the chuck. saidbody to engage across one end of said jaw i do and force the oppositeextreme end thereof into contact with said tool shank.

3. A chuck including a body having therein a recess for a drill shankand holes intersecting said recess on opposite sides thereof, a set ofchuck jaws for securing a tool shank from turning movement in saidrecess, auxiliary jaws located in saidholes for engagement of theirextreme ends with said tool shank, and a clamp sleeve screw-threadedlymounted on said body to engage across one end of each of said jaws andthereby force the extreme opposite ends of said jaws into contact withsaid tool shank on opposite sides thereof.

4. A chuck including a body having a central recess therein, a set ofchuck jaw openings obliquely arranged therein, a set of holesintersecting said central recess, chuck jaws located in the chuck jawopenings to engage the sides of a tool shank and hold a tool fromturning movement, a jaw actuating sleeve for said chuck jaws, auxiliaryjaws located in said holes and movable lengthwise therein, and anauxiliary jaw actuating sleeve screw-threadedly mounted on said bodyto'engage across one end of each of saidauxiliary jaws and-thereby forcethe opposite extreme ends thereof into contact with the tool shank, saidsleeve covering the openings for the chuck jaws in said body.

5. A chuck including a body having therein a recess for a drill shankand holes intersecting said recess on opposite sides thereof, a set ofchuck jaws for securing a tool shank from turning movement in saidrecess, auxiliary jaws located in said holes and obliquely arranged andmovable lengthwise for engagement of their extreme ends with said shank,and a clamp sleeve screw-threadedly mounted on said body and having arecess witha sloping bottom to engage across one end of each of saidjaws and thereby force the opposite extreme ends of said jaws intocontact with the tool shank.

6. A chuck including a body having a central recess therein with chuckjaw openings extending obliquely therefrom and holes intersecting saidcentral recess, means for securing a tool shank from turning movement insaid recess, auxiliary chuck jaws with squared outer ends located insaid holes, and an auxiliary jaw actuating sleeve screw threadedlyengaged with said body, said sleeve having a recess with a slopingbottom to engage the squared ends of said jaws.

7. A chuck including a body having a central recess therein with chuckjaw openings extending obliquely therefrom and holes intersecting saidcentral recess, means in said openings for securing a tool shank fromturning movement in said recess, auxiliary jaws with flat inner endslocated in said holes to engage opposite squared sides of a tool shank,and anauxiliary jaw actuating sleeve screw-threadedly engaged with saidbody and engageable with said auxiliary jaws across the ends thereof toforce them by lengthwise movement to engage across their opposite endswith said squared ends of said tool.

GUSTAF A. ENGLUND.

